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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fbabb66d59bb6ad359205a0bd44e11b64d4d12797d97f2c82272022096865f' 
  AND token = 'cn+b2dk3s7ky7Ur3viaCKy8ZTM1J7SAMZmNKZa8Maww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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