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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3863e8ea312d16f1161369b3991041ec020024076ee2efe78f5da2deb2caa35b' 
  AND token = 'n7/cWeyMhq82wY2TO5jtmLoXYZT8McaaR/Z41AcGqOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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