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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93425dd478e24ad8e1ae6308e4bd2f16e436b173fc93bd8ce682c84a6503c726' 
  AND token = 'vLHqQcjE6GaeW/+MevQF/VmQcRXeLYtt4h8mG+5LvJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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