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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f5546764049d0062af0e65984a5512ea56d50c3c710d2719551e03499467cce' 
  AND token = '3vIIbcfZqiOTvR+6rFGG1Auic371lMOY2JiEN2kqOW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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