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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b82760840577d382ba604099ce7349e32ec41def7af639795145bf8b8869bfb1' 
  AND token = 'umknf0yS4vxlycYRSG1g8dbfmU4a8ZLwb/dimrpaJEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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