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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94bb5130ce3ba9174a5d5dda5eea0d50cfc93c8f3f22a913da00e3946ff17297' 
  AND token = 'pYlXlAB35edgHvN0K+3wZj8vQP9d75shmtvlUNxmYfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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