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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f81323ded24df9afdfeb9bad6f896cdb2daf4a07425dcde8fcaef90d596e93c' 
  AND token = '7YWp4UJne3W/gPThwNRfMKfbaOhR1Uvhx/nVC2ss1ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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