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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84145d4ac04a6a8fa146324ae89709b75efd314e1285ed35c08bb47f341a8399' 
  AND token = '2b1CAYVaE2F0TyAIjpvo3Jn66sJMT2kj5W/AAfY+3o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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