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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee762f643273f4132f71e70d7a7f081d8acb29ec4c18c912831774c5af34030d' 
  AND token = 'T3dHYR3DeaXIqo1Ux9p1ByRYhQKHh427y+evfPNr2Mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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