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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13a3664a7428807bc30246c8cc6130fa030044c8612899a517d4d3f430fa7204' 
  AND token = 'JQ/s1gli/3ZSU0Dww4sbjQKZfMg9guphgiDTxoQxW3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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