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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7feebd63d61b1df892dd1fdc1280a402955753cc460cd28ba9d9206d34bea34' 
  AND token = 'qo1bt1vJMoqv1eBV5ncaRaekFKAcAZrzsL1ACTGEovw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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