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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bf2d1dd9e1df03f1d3b8e52358f9e52043120cd91106bc77d92239b1672113c' 
  AND token = 'Qqh32iJmQaeiRSpl0MsHz6aH2tV0gwSndaFGGOLqydc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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