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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ce34497d32ce1131c20696f9d7fb04f84a1927eb2f4fc68a82b72afd1d0c02' 
  AND token = 'v18iQIrYtoJG8ZzdJyGD+mpP/WtnLby2zSREdV3B8y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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