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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8b38000fd88fec914e20a73dafba349774b960d9f7c502852202b140069936' 
  AND token = '6RVVGgQqZdO186x+z9qcvIoW3zGFWaabMSiFI8KxD4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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