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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9681d3fe37b3272c607599c25888c093d71e733b753ac4e77e702e2ced87ec' 
  AND token = 'bsf2z3MgX6mPbzDgwF4xCuC3DfH8ayjFL8Yqu6kWehk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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