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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec9d82bef81c6634e7715c9869f916d20a9624d129fa46f7939c873a4d86d653' 
  AND token = 'DtQzVgZ3LBWri0hWEF4eMGKbXqh6ju1sfsd6HcM40jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00967

JSON explain

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