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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7440ef1c0cc95acfaf5d98564829f3194cab0db163e7dc918238757e3e2d9474' 
  AND token = 'Mr2MAVamvTW8JbWy1JoTqrEXBAjd7t2UF45V3IISJ58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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