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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83867867e2bb3fb6b3b6b0c96db1c34667c78391702ab851bdd1082512efc00' 
  AND token = 'E6emgksu1Qx3BFsG9GXbm8TBrCJGtKhsk4pnK9Ok39M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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