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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2542fe7144932ce5fb9f5f45398b0b6577ed4bf2f12668a7bb164a602cca47c9' 
  AND token = '2gl7TDIZPBIugr77NC4UNTlfrRi5HSOm77J5LEjS2V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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