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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7ec06fde16e85de55aec843db51be8d0cc125f5acef233e36767b3d84689f4' 
  AND token = 'dTQHosHz3A+18hqVD5X1lM+x8aDWQ2aS4Q+bquzpv/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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