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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37132dabb4a40d9d8ae49674828a84511fd8f7881aeb8470707f3e58eb710c11' 
  AND token = '35PEtXodYWb3Wse4lwikP62diJQBNFOrDnfN5qJcaQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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