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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19d66d98000eeff32205212682295af02861ac717c5262439f0d00df3c85ee5' 
  AND token = 'opunUPFf7vnuEMV5PZEZrCKetAZnBpeYueU/3omMfpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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