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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e25d102c565c83509409c1c8132b79c2061438e777105fd07053b8a99dba356' 
  AND token = 'g0CJAFE77QOJOYacegSKJaMA8JJSkueZs7r5emebGw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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