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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5036671b8fa7e6a789bd5e970bcbb5b2f898a03f839a8cb5a756a3041958c3b3' 
  AND token = 'ms5buXX+04takg4jQ1o5SzmZPc+WQo3yC3ab1GZYQ8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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