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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91a3ea0584a0d553c1d7a04dced292ab18469398e05b38d6217f392d09df92ce' 
  AND token = 'q7r8McgTvWtR6nkumUixTM0Atere29/hGQCi5hnNjdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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