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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f127410c40cc1925f9776c2bdcc2dd00b27f53d6f011c4be0ec2b9f0c05251' 
  AND token = '/Ko/sLk1AoR1gtu5UIMQAAeAFa9/RaYhRTqUxUZeIfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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