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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e829429477e0e284be60ac23c94fb56dde3d9e2535cd760f55ebcd9ee06f3366' 
  AND token = 'dqA2A6PQr/erKjoBw72P6urE0JJvsm1KmdIEtblv+Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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