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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a07a36faed27e249f06fa5d0b86e594cc13faa74aa7d232d8416819cde42c2a2' 
  AND token = 'E0tESqpUo6amj73bHnU5gvVkcGARuib1lYNXrrAcAzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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