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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77bee3b7dc27c3df8982a6f9a43a60073a256ae64fef313c09e87f2ee4594743' 
  AND token = 'MYicxMlSXRfTH9DgCUbAggeF8yoyrouM1mywZQ8M7VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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