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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '855f37e07ae1f7a4d5f4dc91b534af0ce959ff9d0a0504daad9b957946285f27' 
  AND token = 'OtvXxJKzmfcrF/N0TOrcIR9FsstorDP5qXQ9wXHeP/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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