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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebc61d36fc025fce2087457c38eca2956e380c219c455c4ea270d4d7de079315' 
  AND token = '36PSlsB3LSzoyaIlbFFGMEzX+qBJ9/hvyAa2qvUab9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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