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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b4d3c4e44d23fead338cbe1be5870e2ea7249dcfc988b66ef274387d60e6182' 
  AND token = '/jk34jmsEx8E+qQvBh6FB2mhhZ47ToTia822ErSTYpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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