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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76eb124d6cc905e9b30a34df33e149a5a50cb7527e3e0ba472da4421f3091e3' 
  AND token = '+cODiEV4Ki7HQKvgXYBLEEo15YM1zkWTiFnFf8lfGzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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