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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e23379392ee0a9dea85acc3e04a04594b4058ac922bad3f1ef5112a6f1bbf2' 
  AND token = '8xNxBGAP17/s1JUZrlYR8DlSraiW04TwxTtGUPxc7K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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