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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd2cea4469333bd9396583a54b0302929ae64094c26219300382e834fc53fedc' 
  AND token = 'S52QfOMCEkf31seaJBQ2DfU2ajUyZhMjSHTOIP2b/cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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