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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15bb1e77c5be95c09cc007745a709b4fb413acb80c7d2083e049aaa142bb777f' 
  AND token = 'l/U+INhbJZbkV8tIMa1WvX9wHEB66qjiq9H7VZSRLbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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