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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '845e296d4cb24a5e5ee4851eec2497a6c63ee38f2fb34e7dc36054f2800fc720' 
  AND token = 'xT1wCqx5KxgA1pEv8F24IeEiR80Mvt3exY92LGQWWfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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