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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5095fa764ab673d25880ea31f8971decd468e31ed2b2955d011b728580e54fd7' 
  AND token = 'FYrZzDdE2p6mcCzwqcE4xXuv01yTvn+6NBkbgflgwFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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