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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0fd5bd6693d00c6ce01f1607183c2118e133cf20e713c7f39699ec1230f752' 
  AND token = 'vKeFZIMBQy8Hjb7B0kt+c8soAEUhXS6aJ6C0sdamNy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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