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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93b05a7b411a6ae3a5c6253bb58136ba7efe992e9b1bd9740b4ecb15657603ad' 
  AND token = '0zlmRcix5rrJMOvn0rAmjb1PVcN50uHnVpIx6XIPIAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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