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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce9a4ea326813ecfd914e72949ce166374e5fb5521b5af9c185a30c09206e848' 
  AND token = '5HyTWhW+NhaQ3aSQbTSur4e8YDAooRyhB5We4oRdONQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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