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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2deb83a7c6ffe9fd835394dac9e9e1ec741d1c99908245a96b1cd492275e9e7f' 
  AND token = 'Pvu9cuVhLHMiA2hnS1p0cNeLk54thNnDZmfp5vKo/pE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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