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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6a8c65c485da5ba3c128efe3ff43d79460ee4a3ebe2a94ada892f5a0b58282' 
  AND token = 'O0YGN6g9uUiLoyfZ5RnhMa8q4t79fD18x+wAs5TaVac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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