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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c602c04c5c6169205c22e981d66f005ced210930e9054dd2f3140209460d6f3' 
  AND token = 'EKb7dCzXm9D3LnQne32pf6Qmftz5j8LmQggo7kl5LAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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