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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26469715cc6c3ae94bc662a5457f6ece9d7207603169c9462756e394924866e5' 
  AND token = 'FFerQvGipTHwWcPAcfqmcKcJpsqPh6YT0ErInGUb1LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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