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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ef16bdc4d2d18c67edb9a9e76b5874f9eaef8f2bbe70448df22127c3ef4384' 
  AND token = 'cypdydUZkx3BT/fj8pgLCJRoc3+ejpdyf+cgdrkMIWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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