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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d75b3371ba9b96e1466c9b0b8d15197bd6a5d53ab8039e6e7654900fa90c1e' 
  AND token = '3sbd0m6nNs7UvS42rIz+0rjn52JQnWIgmwVQwRLYJWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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