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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24c159bb24b75a49daeed78b23a8207ac8afafb82ac0b30bca0455ba0873a1ff' 
  AND token = 'F52eR85reGNkrFrgs/l49ESqwGW/tQqI5W3uLXAJIDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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