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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad7fe22f6a55fde13d4fe25c0c4823efae4e7aebd629e3bab2fc38ecb1ef5bb' 
  AND token = 'AuxXpF/7PmMJShbKiwuqwGYaMun8NyU5eWQTJxAzknA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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