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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29fb111cd6a0eabb91acc1b7969f927c5f5005b606cc3f069b5abb9d6867e0f6' 
  AND token = 'JGHDkmVsyLJm6gvqByLorxNXRteqI1+Ww7yRIVeExn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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