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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd4ba5f0d730396a717494a4c93e47a67e4eafcc6fcd9f4b256551fa802f0f7' 
  AND token = 'AgQGu4/MElUf3GEWafvzgRfDyosejirjsd4+C3HhZEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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