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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fef73e24f58936a142d58ce3266a7925c743f9e0055ca94ae89930d2e288b44' 
  AND token = 'lAIIMoiAY9l2t6tZ4HR3gCUklwu+Sfh8qQYSxcJx7IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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