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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b27a584dae34af48bff08cd966018cc158e9221b5ce1d33388b6945ef9a6f1' 
  AND token = 'Ho+UJ/86GHO3F9SH8VpnIRGly/KZIWbINtF2T8M3W4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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