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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0f4196a996853a98d1e7977aa957aadae26a79340ec8544a4010d92c0428b2' 
  AND token = 'VcfFEcWgO2Fbs2zIiBBGTfqXUgVE7XFMGdp7ZYSzkas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}