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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a78da231e0bbf5d625751a2acf32436d78f93f8f997efbd3c3d68c7bdcccda' 
  AND token = '6dEjGjYqIgXjto59AednbThm7PmIeJMH4SAhUIySYQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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