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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd5b51678d5917b76a5912ee3a522101d69db4f1b3464811c99c651c5fd98489' 
  AND token = 's08Q7rCCUgyZRFUfttE8fnNGwGmzfgLq8SLsoYgs9i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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