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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fafc1cb757dcd8cdb7c12841591cca73f7c360a0971230f91e474eafb48e38d8' 
  AND token = 'CiejLw6IrKObR0xiMO4gL01+r5dn7w6Jwi0vkI2/3wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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