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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '052479a5684e4c59edd3ad0e71efe9b55f18cb2bcde9003c08cc10f23ef07ede' 
  AND token = 'RG2b6zepHsWSZsQCd7TkGOwqpXCetatd7SH3N3hEiiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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