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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '591b8de5e5290ca1effe51ab2a55476b85a38ffd964f43b27f7347391e005313' 
  AND token = 'CVCifdAiYX0ax+1FC0Q/aLuxP/siL8DdzdxTe70QCuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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