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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6b2d231151c83dec0a494f4cafdb7191cf27c32c2a5a79c8cf992de703f86a' 
  AND token = 'E0aFkaA6hS6aogQ9kh2cW1Aawpiyvs97NATAh2xUgrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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