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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a34dd840f483d44b72d2fd2616ee9c4fbdb0ffa729c1db0c07f0b8e0488f91f2' 
  AND token = 'eJSgLckWzkIaAa051x1H5qfq9337SPaboxa1u7UmQHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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