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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96103ab30686bfb4ccd5472ba02ae940eeb1b1ce06ac99a6453127a4fa3dace4' 
  AND token = 'O0Q9rq0ZpbGsFWvNTdH8PWyB4s2BH2FoGN8hwNN0DqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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