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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d49581eb11b226030eeea386352ab7bc87ad0fc0bcbe5d5de5741c8c6e55f69' 
  AND token = '2wiqRl0K9SmCMqIJIkJJLsacXKRzrXry42CTo/8YQm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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