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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a903fd9d6c1c121e3154ae739e1354829a7cc05aee98fd9f925972091ce229' 
  AND token = 'A8jNkdE3Jkz1gOZ7QWLfOOsP0sILWfJZESZ8kaJZv9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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